TY - JOUR
T1 - Development of coupled FE/BE models to investigate the structural and acoustic responses of a submerged vessel
AU - Merz, Sascha
AU - Oberst, Sebastian
AU - Dylejko, Paul G.
AU - Kessissoglou, Nicole J.
AU - Tso, Yan K.
AU - Marburg, Steffen
PY - 2007/3/1
Y1 - 2007/3/1
N2 - An analytical model and a fully coupled finite element/boundary element model are developed for a simplified physical model of a submarine. The submerged body is modeled as a ring-stiffened cylindrical shell with finite rigid end closures, separated by bulkheads into a number of compartments and under axial excitation from the propeller-shafting system. Lumped masses are located at each end to maintain a condition of neutral buoyancy. Excitation of the hull axial modes from the propeller-shafting system causes both axial motion of the end closures and radial motion of the shell, resulting in a high level of radiated noise. In the low frequency range, only the axial modes in breathing motion are examined, which gives rise to an axisymmetric case, since these modes are efficient radiators. An expression for the structurally radiated sound pressure contributed by axial movement of the end plates and radial motion of the shell was obtained using the Helmholtz integral equation. In the computational model, the effects of the various influencing factors (ring stiffeners, bulkheads, realistic end closures, and fluid loading) on the free vibrational characteristics of the thin walled cylinder are examined. For both the analytical and computational models, the frequency responses, axial and radial responses of the cylinder, and the radiated sound pressure are compared.
AB - An analytical model and a fully coupled finite element/boundary element model are developed for a simplified physical model of a submarine. The submerged body is modeled as a ring-stiffened cylindrical shell with finite rigid end closures, separated by bulkheads into a number of compartments and under axial excitation from the propeller-shafting system. Lumped masses are located at each end to maintain a condition of neutral buoyancy. Excitation of the hull axial modes from the propeller-shafting system causes both axial motion of the end closures and radial motion of the shell, resulting in a high level of radiated noise. In the low frequency range, only the axial modes in breathing motion are examined, which gives rise to an axisymmetric case, since these modes are efficient radiators. An expression for the structurally radiated sound pressure contributed by axial movement of the end plates and radial motion of the shell was obtained using the Helmholtz integral equation. In the computational model, the effects of the various influencing factors (ring stiffeners, bulkheads, realistic end closures, and fluid loading) on the free vibrational characteristics of the thin walled cylinder are examined. For both the analytical and computational models, the frequency responses, axial and radial responses of the cylinder, and the radiated sound pressure are compared.
KW - Boundary element method
KW - Finite element method
KW - Fluid-structure interaction
KW - Low frequency analysis
KW - Submerged cylinder
UR - http://www.scopus.com/inward/record.url?scp=34547469561&partnerID=8YFLogxK
U2 - 10.1142/S0218396X07003196
DO - 10.1142/S0218396X07003196
M3 - Article
AN - SCOPUS:34547469561
SN - 0218-396X
VL - 15
SP - 23
EP - 47
JO - Journal of Computational Acoustics
JF - Journal of Computational Acoustics
IS - 1
ER -